Begin Hnefatafl from the game kit

deploy/verify-ledgers.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# The determinism gate: fetch every production ledger and replay it with the
+# LOCAL engine, comparing each room with what the server shows. A ledger the
+# new engine replays differently would rewrite a game in progress when the
+# server restarts, so this runs before every deploy.
+#   deploy/verify-ledgers.sh <droplet-ip-or-host> [https://site]
+set -euo pipefail
+HOST="${1:?usage: verify-ledgers.sh <droplet-ip-or-host> [https://site]}"
+SITE="${2:-https://hnefatafl.kestrelsnest.social}"
+DIR="$(mktemp -d)"
+trap 'rm -rf "$DIR"' EXIT
+rsync -az "root@$HOST:/var/lib/hnefatafl/rooms/" "$DIR/"
+npx tsx deploy/replay-ledgers.ts "$DIR" "$SITE"